Snap fastener member



Patented Mar. 26, 1935 SNAP FASTENER MEMBER Moses F. Carr, Lincoln, Mass., assigner to United-V Carr Fastener Corporation, Cambridge, Mass., a corporation of Massachusetts Application January 17, 1933, Serial No. 652,158

3 Claims. (Cl. 24--218) My invention aims to provide improvements in snap fastener members. Y

In the drawing which illustrates a preferred embodiment of my invention:-

Figure 1 is a plan viewof'a socket member of a snap fastener embodying myA invention;

Fig. 2 is an enlarged Yplan view of aportion of the socket shown in Figure 1 as viewed from `the reverse side; f

Fig. 3 is a section taken on the line 3 3 of Fig. 2; and

Fig. 4 is a section through a complete carpet fastener socket installation.

My invention is particularly adapted for use in connection with the attachment of sockets or studs to carpet or like material and relates particularly to the construction of the prong-and adjacent support-engaging base.

In the particular embodiment of my invention selected for l illustration I have shown a well known type of carpet fastener socket having prongs adapted to be hooked into engagement with the backing of the carpet. 1 The socket'includes a carpet-.engaging base 1 providedV with a stud-receiving aperture 2 surrounded and intersected by a yieldable spring 3. The spring 3 is held in assembled relation with the base l by` a spring-retaining ring 4 in the usual and well known manner.

The basev 1 has a raised rim portion 5 adapted to contact directly with the carpet 6 (Fig. 4) and attaching prongs 7 extend from the periphery of the rim 5 upwardly., outwardly and downwardly into a hook-like engagement with the carpet.

The socket member thus far described is substantially the same as that more fully illustrated and described in United States Letters Patent to Fred S. Carr No. 1,535,981. It has been found that flat prongs extending from the socket, as shown in that patent, have a tendency to collapse to a certain extent rather than to curve outwardly and downwardly. Furthermore, there is a tendency for the rim'po-rtion adjacent to the periphery of the socket to collapse, thereby providing an imperfect attachment. My invention overcomes the objections just mentioned because the prongs are curved in cross-section transverse to the length of each prong. This curve is particularly desirable adjacent to where the prong joins the rimportion 5 thereby to increase the stiffness near the lower end of each prong. lThe rim portion'is upset adjacent to where each prong '7 connects therewith thereby stiffening and preventing collapse of the rim. The curve of each prong and the depression 8 formed adjacent to each'prong in the rim 5 are best illustrated by Figs. 2 and 3 of kthe drawing.

By curving the prongs 7 and forming the stiffening depression 8 in the rim 5 I have improved the fastener to such an extent that during the setting operation of the prongs into engagement with the carpet 6 the ends of the prongs readily curve outwardly and downwardly to provide smooth hook-like portions without wrinkling or crushing the lower portions of the prongs where 10 they join the rim 5. During the upsetting operation there is considerable pressure exerted upon the prongs in a direction toward the rim 5, but since the. rim is strengthened by theupset portions S that pressureY has no affect on the rim and it remains in its original shape. The net result of my invention is to so strengthen the rim` 5 and the prongs 7 adjacent to where they join the rim that it is impossible during the normal setting operation to crush or upset the prongs except as intended. My improved structure has been tested, approved and put into commercial use. It has been-found to be entirely satisfactory and to provide an improved and more durable attachment than has been possible heretofore with fasteners having prongsproviding the only means for attaching the fastener members to their supporting structures.

While I have illustrated and described a preferred embodiment of my invention, I do not wish 30 to be limited thereby, because the scope of my invention is best defined by the following claims.

' 1. A snap fastener member having a supportengaging base, means carried by said base for cooperative snap fastening engagement with an- 3 other snap fastener member, anda plurality of attaching prongs extending from said base and adapted to be bent into hook-shaped form when the fastener is attached to a support, said at- 40 taching prongs being curved in transverse crosssection particularly adjacent to where they join the base, and said base having narrow upset portions extending radially inwardly from where the prongs join the base thereby to strengthen the prongs and base.

2. A snap fastener member having a supportengaging base provided with a raised rim, means carried by said base for cooperative snap fastening engagement with another snap fastener member, a plurality of attaching prongs extending from said raised rim at the periphery thereof and adapted to be bent into hook-shaped form when the fastener is attached to a support and stiifening means formed in said raised rim in attaching prong curved in transverse cross-section extending from said rim 5 at one end of the depressed portion 8, said snap fastener member presenting means for snap fastening engagement with a companion member.

MOSES F. CARR. 

